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/*
* Copyright (c) 2006-2018, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2018-06-12 zylx the first version.
*/
#include "drv_pcf8574.h"
#define PCF8574_I2CBUS_NAME "i2c1"
static struct rt_i2c_bus_device *pcf8574_i2c_bus;
int pcf8574_Init(void)
{
rt_uint8_t value = 0x01;
pcf8574_i2c_bus = rt_i2c_bus_device_find(PCF8574_I2CBUS_NAME);
if (pcf8574_i2c_bus == RT_NULL)
{
rt_kprintf("can't find i2c device\r\n");
return -RT_ERROR;
}
if (!rt_i2c_master_send(pcf8574_i2c_bus, PCF8574_ADDR, 0, &value, 1))
{
rt_kprintf("can't find pcf8574\r\n");
return -RT_ERROR;
}
return 0;
}
INIT_COMPONENT_EXPORT(pcf8574_Init);
rt_uint8_t pcf8574_read_byte(void)
{
rt_uint8_t temp = 0;
rt_i2c_master_recv(pcf8574_i2c_bus, PCF8574_ADDR, 0, &temp, 1);
return temp;
}
void pcf8574_write_byte(rt_uint8_t data)
{
rt_i2c_master_send(pcf8574_i2c_bus, PCF8574_ADDR, 0, &data, 1);
}
void pcf8574_write_bit(rt_uint8_t bit, rt_uint8_t sta)
{
rt_uint8_t data;
data = pcf8574_read_byte();
if (sta == 0)data &= ~(1 << bit);
else data |= 1 << bit;
pcf8574_write_byte(data);
}
rt_uint8_t pcf8574_read_bit(rt_uint8_t bit)
{
rt_uint8_t data;
data = pcf8574_read_byte();
if (data & (1 << bit))return 1;
else return 0;
}
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